[#713] API to identify bundle resources (like images)

[ruspl-afed]

ImageIdentity interface with surrounding types

Fixes #713

[github-actions]

Test Results

0 files   -   663  0 suites   - 663   0s ⏱️ - 1h 17m 23s
0 tests  - 2 209  0 ✅  - 2 161  0 💤  -  47  0 ❌  - 1 
0 runs   - 6 771  0 ✅  - 6 627  0 💤  - 143  0 ❌  - 1 

Results for commit 1de9829. ± Comparison against base commit caf78f7.

[fedejeanne]

Hi @ruspl-afed.

Just following up yesterday's discussion in the community call. I have a question: would it be possible with this approach to somehow "swap" images/icons in runtime?

The reason I ask is because a student of mine is taking a look at how to switch (all) icons at runtime based in some property (let's call it "icon theming") and I thought the solution you propose here might be useful for that?

Our initial idea was to provide the themes in bundles and to put (all) icons inside a folder with the name of the theme in there, something like:

themeA (bundle)
'-- resources
  '-- icons
       '-- themeA
           '-- ... (the icons)

themeB (bundle)
'-- resources
  '-- icons
       '-- themeB
           '-- ... (the icons)

So if one could switch from themeA to themeB in runtime then icons would be taken from another folder. I assume one would have to add one placeholder to the URL of the icons in the consumers (something like today's $nl).

Would that be doable with this approach?

[ruspl-afed]

would it be possible with this approach to somehow "swap" images/icons in runtime

This approach suggest rather normalized way to work with image resources than direct solution for "swap" problem.
However with suggested approach it may be a bit easier to implement what you want.

1. wrap ImageRegistry with another type ImageIdentityRegistry that works with ImageIdentity
2. provide Theme-aware implementation of ImageIdentity that will calculate URL based on active Theme
3. implement "change theme handling" for ImageIdentityRegistry -> it will clear and refill underlying ImageRegistry with images for new active Theme.